摘要
利用水热法分别合成NaNbO3与KNbO3粉体,将其按摩尔比1∶1充分混合均匀后,于1 040～1 100℃常压烧结2h制备了(K,Na)NbO3(KNN)无铅压电陶瓷。研究了烧结温度对KNN陶瓷的相组成、显微结构、体积密度及电学性能的影响。X线衍射(XRD)结果显示,混合粉体经烧结后形成了单一的铌酸钾钠固溶体;场发射扫描电镜(FESEM)测试分析表明,适当提高烧结温度能促进陶瓷晶粒长大,提高其致密度,从而改善样品的压电性能。当烧结温度为1 080℃时,陶瓷的体积密度达到最大值(4.46g/cm3),此时性能最佳:压电常数d33=96pC/N,平面机电耦合系数kp=0.37,品质因数Qm=108,介电常数εr=450,介电损耗tanδ=0.024和居里温度TC=417℃.
After NaNbO3 and KNbO3 powders were prepared respectively by the hydrothermal synthesis method,the obtained powders were mixed with the molar ratio of 1∶1,the（K,Na） NbO3（KNN） lead-free piezoelectric ceramics were obtained by sintering at 1 040-1 100 ℃ at normal atmosphere.The effect of sintering temperature on phase,microstructures,bulk density and electrical properties of KNN ceramics were investigated.The XRD patterns showed that the single solid solution of（Na,K）NbO3 ceramics was acquired.Besides,FESEM micrographs exhibited that appropriate sintering temperature would improve grain growth and increase density,thus improve the piezoelectric properties of ceramics.Samples sintered at 1 080 ℃ had the maximum bulk density of 4.46 g/cm3,and exhibited optimal performance of d33 of 96 pC/N,kp of 0.37,Qm of 108,εr of 450,tan δ of 0.024 and TC of 417 ℃.
出处
《压电与声光》
CSCD
北大核心
2012年第5期756-759,共4页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(50862005
51062005
91022027)
江西省教育厅资助项目(GJJ11197)
江西省主要学科学术和技术带头人培养对象计划基金资助项目([2010]224)
关键词
水热
铌酸钾钠
电性能
hydrothermal
potassium-sodium niobate
electrical propertie
